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I'd always understood that a lot of the deaths on Everest were the result of wealthy people not preparing properly for the climb. If you've seen the IMAX Everest movie, you see the incredible shape that team was in...and they still had a hard go of it. I imagine attempting in anything less than exquisite physical condition is asking for trouble.

Mogens Jensen's training regimen can be found here:

http://www.gsk.com/people/mogens/training.htm

That said, he was an asthmatic attempting to climb without O2.

I attended a lecture several years ago by a photographer who has climbed Mt. Everest several times. He said his usual workout was a long session on a stair climber machine, set to maximum difficulty.